Dwyer TDFS User Manual

Series TDFS Thermal Dispersion Flow Switch

ABLE

ABLE GLAND

STATUS

INDICATOR

ETPOINT

ARGET

PROCESS CONNECTION

1/2˝ NPT

ENSOR

-9/32

[108.74]

1-7/16

[36.51]

-1/8

NC = Open, NO = Closed, LED = Green

Deadband

NC = Closed, NO = Open, LED = Red

Setpoint

Higher

Flow

Specifications - Installation and Operating Instructions

Bulletin F-TDFS

he Series TDFS is a thermal flow switch that indicates whether the flow rate is above

or below a user set flow rate. The unit incorporates two LED status indicators providing visual switch indication. The set flow rate (setpoint) is field adjustable and the unit has both NO and NC NPN outputs. See Figure 1 for output and LED actions on change of flow.

FIGURE 1: Switch Setpoint & Deadband

OPERATING PRINCIPLE

The TDFS uses an impulse thermal dispersion measurement technique to measure the flow rate. The probe is heated above the process temperature and then is allowed to coo l. The flow rate i s determined from the rate at which the probe cools. The measurement cycle time is approximately 8 seconds.

INSTALLATION

CAUTION

WARNING

device and/or object may become a projectile.

NOTICE

device operates properly if either is present. The setpoint will shift if the specific heat, density or viscosity of the fluid changes.

Ensure that the process fluid is compatible with the wetted materials, and do not exceed the maximum device ratings

Ensure that the system is not pressurized before installing or removing this device or other objects from the system. The

Do not use with abrasive fluid mixtures (The polysulfone may be abraded.)

Use caution if fluid temperature changes or fluid composition changes are present in the end application. Verify that the

PECIFICATIONS

S Service: Compatible water-based fluids. Wetted Materials: 316 SS, Polysulfone, and FKM. Setpoint Range: 0.5 to 10 ft/s (0.15 to 3.0 m/s). Repeatability: 0.07 ft/s +3% of setpoint. Typical Deadband: 0.1 ft/s +15% of setpoint. Temperature Limits: Process: 5 to 185°F (-15 to 85°C) (non-freezing); Ambient:

5 to 167°F (-15 to 75°C), Storage: -40 to 185°F (-40 to 85°C). Pressure Limits: 300 psig (20.67 bar), max. momentary surge: 500 psig (34.47 bar).

Response Time: Approximately 8 s. Power Requirement: 9 to 24 VDC. Switching Current: 400 mA, derate 5 mA/°C above 23°C. Current Consumption: Average: 93 mA, Peak: 300 mA. Electrical Connection: 1/2˝ NPT female with 4 conductor 22 AWG, 6´ (1.83 m)

long, optional cable gland.

Process Connection: 1/2˝ NPT male. Enclosure Rating: NEMA 4X (IP65). Housing Materials: 316 SS, 416 SS, polycarbonate, neoprene, and acrylated

urethane.

Switch Type: 1 NO NPN, 1 NC NPN. Input Power and Protection: 0.5A fuse (resettable) reverse polarity protected. Switched Output Protection: 0.5A fuse (resettable) reverse polarity protected. Agency Approvals: CE, RoHS.

W.E. ANDERSON DIV., DWYER INSTRUMENTS, INC.

P.O. BOX 358 • MICHIGAN CITY, INDIANA 46360 U.S.A.

Phone: 219/879-8000 www.dwyer-inst.com Fax: 219/872-9057 e-mail: info@dwyer-inst.com

ount the TDFS so that the sensor extends into the flow by 10-25% of the pipe ID.

K OK

UBBLES

(

AVOID)

EDIMENTS

(

AVOID)

30° 30°

POWER (RED)

NO (WHITE)

NC (GREEN)

TDFS

GROUND (BLACK)

HOUSING (DRAIN WIRE)

LOAD(S)

DC SUPPLY 9-24 VDC

EARTH GROUND

–

STATUS INDICATOR

SETPOINT TARGET

se PTFE tape on the process connection to reduce the risk of leaks. For proper flow

easurement, the sensor must be fully submerged in the fluid. Bubbles, turbulence,

nd sediments will cause improper operation. For best operation, mount 30° to 150°

a off vertical on horizontal runs (See Figure 2). Allow a straight run of at least 12 pipe diameters upstream and 5 pipe diameters downstream to ensure optimal flow measurement. For optimal repeatability, ensure the flow switch is not operating in the

ransition region (laminar to turbulent flow).

IGURE 2: Mounting Orientation

LECTRICAL CONNECTION

he power input and switched outputs are individually fused at 0.5A and are reverse

olarity protected. A shielded 4 conductor cable provides the electrical connection to

p the TDFS. The cable drain wire must be connected to earth ground in CE applications or when strong RF fields are present.

Two open collector switched outputs are provided. One is normally open (NO), and

he other output is normally closed (NC). The output logic is shown in Table 1.

pen

NC Open Closed

pen

Condition Flow Above Setpoint Flow Below Setpoint

ff/Internal Fault

TABLE 1: Open Collector Operation

FIGURE 3: Wiring Diagram

SETPOINT ADJUSTMENT

The setpoint may be adjusted with the supplied magnet. There are two setpoint targets on the unit located under the LED status indicator on opposite sides of the unit (see Figure 4). Either setpoint target may be used, and either end of the magnet may be used. If the setpoint does not set easily, try reversing the magnet.

NO Closed Open O

etpoint request is recognized. The slow blink will stop when the setpoint has been

tored.

TATUS INDICATOR

The status indicator (See Figure 4) provides visual indication of the TDFS status. Two status indicators are located on opposite sides of the unit. Each status indicator has one red LED and one green LED. Table 2 describes the status indicator states.

f an error condition is present, the unit will continue measurement attempts until the

roblem has cleared. The status indicator will cycle on and off during this time.

escription

Off

immed Pulses

teady

ariable Length

low Blink

S (2/3 second)

OTICE

RESSURE DROP

Velocity ft/s (m/s)

.5 (0.15)

1.0 (0.31) .0 (0.61)

3.0 (0.91)

4.0 (1.22)

5.0 (1.52)

6.0 (1.83)

7.0 (2.13)

8.0 (2.44)

9.0 (2.74)

10.0 (3.05)

AGENCY APPROVALS AND TEST STANDARDS

CE: CENELEC EN 55011: 2006

CENELEC EN 61326-1: 2006 IEC 61000-4-2: 2008 IEC 61000-4-3: 2006 IEC 61000-4-4: 2004 IEC 61000-4-5: 2005 IEC 61000-4-6: 2006 CENELEC EN 55022: 2006 FCC PART 15 CFR TITLE 47: 2008 ICES-003: 2004 Digital Apparatus (Industry Canada) ANSI C63.4-2003 2004/108/EC EMC DIRECTIVE

MAINTENANCE/REPAIR

Upon final installation of the Series TDFS, no routine maintenance is required. The Series TDFS is not field serviceable and should be returned if repair is needed. Field repair should not be attempted and may void warranty.

olor

N/A

R Green

ed & Green

A Green

ed & Green

R Alternating

TABLE 2: Status Indicator States

Design a fail-safe system that takes into consideration the possibility of switch failure, power failure and operator error.

TABLE 3: Pressure Drop (water)

tate

Waiting for first measurement or unit is off

tart of a measurement cycle

S (normal operation)

low is below the setpoint

F Flow is above the setpoint

rror condition:

1) Process temperature is out of range

( (2) Internal fault

setpoint adjustment was requested

A Flow is in the nominal range

low is below the nominal range

F Setpoint will be limited to the maximum allowable flow

1/2˝ Pipe in w.c. (kPa)

0 0 0

0.2 (0.045)

0.5 (0.125)

0.7 (0.174)

2.6 (0.648)

3.3 (0.822)

4.3 (1.071)

3.5 (0.872)

4.5 (1.121)

3/4˝ Pipe in w.c. (kPa)

0 0

.2 (0.045)

0.4(0.099)

0.7 (0.174)

1.2 (0.299)

1.7 (0.423)

2.1 (0.523)

2.7 (0.673)

3.4 (0.847)

4.2 (1.046)

WARRANTY/RETURN

Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact customer service to receive a Return Goods Authorization number before shipping the product back for repair. Be sure to include a brief description of the problem plus any

FIGURE 4: Set Point Target

Steps:

1) Ensure that the unit is properly installed and powered.

2) Set the system flow to the desired setpoint flow rate.

3) Tap the setpoint target three times with the supplied magnet. Move the magnet approximately 2 inches away from the target between each tap. The taps should be approximately 1 second apart. The LED status indicator will blink slowly when the

W.E. ANDERSON DIV., DWYER INSTRUMENTS, INC.

P.O. BOX 358 • MICHIGAN CITY, INDIANA 46360 U.S.A.

additional application notes.

PARTS If the magnet is lost another can be ordered from Dwyer with part number 100571-00.

Phone: 219/879-8000 www.dwyer-inst.com Fax: 219/872-9057 e-mail: info@dwyer-inst.com